You should be able to access the router using a web-interface. At this point, there should be information about what port(s) are being used.

Like Technochic said, please try to be more specific.
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Ports can be in hexadecimal. Take for example the output from a show ip cache flow on a Cisco router. The source/destination ports are in hex. You will need a conversion calculator like the one in Windows. To find out the standard services on various ports, check out the list at IANA.

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